-----Original Messages----- From: "Wolfgang Denk" wd@denx.de Sent Time: 2014-02-14 00:30:24 (Friday) To: fenghua@phytium.com.cn Cc: u-boot@lists.denx.de, trini@ti.com, albert.u.boot@aribaud.net Subject: Re: [PATCH][RFC v2] add pci 64 bit prefechable mem support
Dear fenghua@phytium.com.cn,
In message 1392282108-56485-1-git-send-email-fenghua@phytium.com.cn you wrote:
From: David Feng fenghua@phytium.com.cn
u-boot did not program the upper 32 bits of prefetchable base and limit in pci bridge config space. I think it's needed when 64 bit address space is used.
You write "I think it's needed" - is it or not?
Do you have a specific test case that fails without your patch, and works with it?
Best regards,
Wolfgang Denk.
There's no test case now (maybe a few days later I could make a test). "PCI-to-PCI Bridge Architecture Specification" require that the upper 32 bit of prefetchable space must be initialized by configuration software. But usually the default value is zero already. A board using 64 bit pci prefetchable memory space and a pci device with 64 bit prefetchable space are needed. I think u-boot did not encounter this situation before.
Best Regards, David